Śrīla Rūpa Gosvāmī has explained kāma-likhana in his book Ujjvala-nīlamaṇi (Vipralambha-prakaraṇa 26): sa lekhaḥ kāma-lekhaḥ syāt yaḥ sva-prema-prakāśakaḥyuvatyā yūni yūnā ca yuvatyāṁ samprahīyate “Exchanges of letters between a young boy and young girl concerning their awakening of attachment for each other are called kāma-lekha.”